One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,8,9)(7,10,11,12)(13,14,19,23)(15,21,16,24)(17,22,18,27)(20,25,28,26)(1,2,3,4)(13,15,17,25,19,16,18,26)(14,20,27,24,23,28,22,21)(6,9)(10,12)(13,16,19,15)(14,21,23,24)(17,25,18,26)(20,27,28,22)(5,7,8,11)(6,10,9,12)(13,14,19,23)(15,24,16,21)(17,22,18,27)(20,26,28,25)(13,17,19,18)(14,22,23,27)(15,25,16,26)(20,21,28,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.